, and results are converted to Peedee belemnite (PDB) through analysis of the standard NBS-19. Results are listed in Tables T1, T2, and T3.
Oxygen and carbon isotopic analyses were made at Woods Hole Oceanographic Institution using a partially automated VG-903 mass spectrometer. This instrument is fitted with a high-sensitivity source and a Pentabloc inlet manufactured by Europa Scientific. Clean samples (without pretreatment) are introduced into a common reservoir of orthophosphoric acid maintained at 90°C by a water bath. The long term analytical precision is better than ±0.10, and results are converted to Peedee belemnite (PDB) through analysis of the standard NBS-19. Results are listed in Tables T1, T2, and T3.
